EDIT: VIDEO---- http://www.youtube.com/watch?v=wFMdfdojvMA
It's a tight fit with 700cx35's. My son grew heavy enough that I no longer felt safe with all his weight over the back tire in the topeak seat. 33 miles r/t on my Madsen was too much for a commute, so I decided to make a longtail for daycare pickup days.
Test Fit, Beer #1 consumed. I even removed the crank/rings and cleaned the heck out of them!
The bolt that holds the tongue snapped when I tried to back the nut off to re-fit. The tongue doesn't go past the chainstay bridge on this 700C bike, so the install is a little bit kludge-y. The bolt that's in there now is good and strong, and I think I found a good setup.
The V-Brake is a tight fit under the Topeak rack. The idea is to use it this spring and summer before throwing on the v-racks it came with and having a more traditional longtail seat. No reason to buy a peapod when my youngest is just about to outgrow it anyway. I think I can get the brake to work, but it will have to always be pretty tightly adjusted unless I can find some thin brake pads or a better washer combination for fit.
Still need to do the brake and shifter cable and throw the chain on. Wish me luck!